Comparative Study of Lexical Combinations in Two Fields of Knowledge (aeronautics and philosophy) and Discrimination Between Lexical Collocations and Conceptual Collocations — This paper deals with word combinations (also called collocations, phraseological units, cooccurrences, etc.) in two different LSPs (Language for Specific Purposes or Special languages) — aeronautics and philosophy. First, a general study of different scientists' approaches in general language and in LSP is provided. Then, the focus is on the discrimination between lexical collocations vs conceptual collocations in LSPs. Finally, an overview of the methodology we used with our master thesis (still in progress) is discussed, along with the presentation of some results.